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<title>Problem 2588. -- Spoj 10628. Count on a tree -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>2588: Spoj 10628. Count on a tree</h2><span class=green>Time Limit: </span>8 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>128 MB<br><span class=green>Submit: </span>28&nbsp;&nbsp;<span class=green>Solved: </span>7<br>[<a href='submitpage.php?id=2588'>Submit</a>][<a href='problemstatus.php?id=2588'>Status</a>][<a href='bbs.php?id=2588'>Discuss</a>]</center><h2>Description</h2><div class=content><div><span style="font-size: medium">给定一棵N个节点的树，每个点有一个权值，对于M个询问(u,v,k)，你需要回答u xor lastans和v这两个节点间第K小的点权。其中lastans是上一个询问的答案，初始为0，即第一个询问的u是明文。</span></div>
<div><span style="font-size: medium"><br />
</span></div>
<p><span style="font-size: medium"><!-- --></span><style type="text/css"></style></p></div><h2>Input</h2><div class=content><div><span style="font-size: medium">第一行两个整数N,M。</span></div>
<div><span style="font-size: medium">第二行有N个整数，其中第i个整数表示点i的权值。</span></div>
<div><span style="font-size: medium">后面N-1行每行两个整数(x,y)，表示点x到点y有一条边。</span></div>
<div><span style="font-size: medium">最后M行每行两个整数(u,v,k)，表示一组询问。</span></div>
<div><span style="font-size: medium"><br />
</span></div></div><h2>Output</h2><div class=content><div>&nbsp;</div>
<div><span style="font-size: medium">M行，表示每个询问的答案。</span></div></div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>8 5<br />
105 2 9 3 8 5 7 7<br />
1 2<br />
1 3<br />
1 4<br />
3 5<br />
3 6<br />
3 7<br />
4 8<br />
2 5 1<br />
0 5 2<br />
10 5 3<br />
11 5 4<br />
110 8 2<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>2<br />
8<br />
9<br />
105<br />
7 <br />
</span></div><h2>HINT</h2>
			<div class=content><p><div><span style="font-size: medium"><br /><br />
</span></div><br />
<div><span style="font-size: medium">HINT：</span></div><br />
<div><span style="font-size: medium">N,M&lt;=100000</span></div><br />
<div><span style="font-size: medium">暴力自重。。。</span></div></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=鸣谢seter'>鸣谢seter</a></p></div><center>[<a href='submitpage.php?id=2588'>Submit</a>][<a href='problemstatus.php?id=2588'>Status</a>][<a href='bbs.php?id=2588'>Discuss</a>]</center>﻿<br>

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